TypeError：无法读取null，单元测试，开玩笑的属性'args'

Question

const zipCod: string [];
const msaData: MSAZipRangeData = {
    id: '09aaf991-4c60-4328-a00a-8915fd44a13c',
    name: 'Oregon',
    parentId: 'cb89e67b-fa1a-4a7e-b55e-1d4c00ec7038',
    zipRange: '41001-41071',
    isCounty: true,
    isUnion: false
};
const zipRangeSave: ZipRange = [{
    msa:msaData,
    msaId: '09aaf991-4c60-4328-a00a-8915fd44a13c',
    zip: '43555',
    zipRangeSize: 3,
}];

    test('Save msa zip ranges', async (done) => {
    msazipPutZipRanges.resolves();
    await msaService.saveMsaZipRanges(msa, zipCod);
    expect(msazipPutZipRanges.getCall(0).args[0].msaId).toBe(zipRangeSave.msaId);
    done();
});

Save msa zip ranges

TypeError: Cannot read property 'args' of null

  492 |     msazipPutZipRanges.resolves();
  493 |     await msaService.saveMsaZipRanges(msa, zipCod);
> 494 |     expect(msazipPutZipRanges.getCall(0).args[0].msaId).toBe(zipRangeSave.msaId);
  495 |     done();
  496 | });
  497 | 

---

export async function saveMsaZipRanges(msa: MSA, zipCodes: string[]): Promise<void> {
    const zipRanges: ZipRange[] = initZipRages(msa, zipCodes);
    await msaZipRangesDao.putZipRanges(zipRanges);
}


function initZipRages(msa: MSA, zipCodes: string[]): ZipRange[] {
    const rangeSize = zipCodes.length;
    const msaData: MSAZipRangeData = {
        id: msa.id,
        name: msa.name,
        parentId: msa.parentId,
        zipRange: msa.zipRange,
        isCounty: msa.isCounty,
        isUnion: msa.isUnion,
    };

    const zipRanges: ZipRange[] = [];
    for (const zipCode of zipCodes) {
        const zipRange: ZipRange = {
            msa: msaData,
            msaId: msa.id,
            zip: zipCode,
            zipRangeSize: rangeSize,
        };
        zipRanges.push(zipRange);
    }
    return zipRanges;
}

无论我如何尝试更改期望值，都会收到此错误，但是该函数带有一个参数，如果需要更多详细信息，我可以发送